Double-cylinder dobby



H. BARDSLEY. DOUBLE CYLINDER BOBBY. APPLICATION FILED um. 22: 1920.

Patented Feb. 1, 1921..

2 SHEETS-SHEIZT 1.

UNITED STATES PATENT OFFICE.

HENRY BARDSLEY, OI" PROVIDENCE, RHODE ISLAND, ASSIGNOR TO CRO'MPTON & KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

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PatentedFeb. 1, 1921.

Application filedMarch 22, 1920. Serial No. 367,862.

To aZZ whom it may concern: 1

Be it known that I, H NRY BnnosLnY, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Double-ylinder Debby, of which the following is a specification.

This invention relates to a double cylinder dobby, and particularly to improved mechanism for rendering the cylinders alternately operative or inoperative.

It is the object of my invention to accom plish such control of the cylinder operation by moving the cylinders bodily to and from operative position, such movement being preferably under automatic pattern control.

In the 'form of my invention herein shown, one cylinder is movable horizontally away from its operative position adjacent the ver tical portions of the dobby fingers, and the other cylinder is movable diagonally downword from its operative position adjacent the horizontal portions of said fingers.

A feature of my invention relates to the provision of lost-motion connections to one of the cylinders,whereby different ranges of movement may be derived from a single cylinder-controlling mechanism.

My invention further relates to improved devices for controlling the cylinder changes and to arrangements and combinations of parts which will be hereinafter described, and more particularly pointed out in the appended claims,

A preferred form of my invention is shown in the drawings in which- Figure 1 is a side view ofa dobby embodying my invention;

Figs. 2 and 3 are sectional'plan views, taken along the lines 2--2 and 3-3 in Fig. 1; i

Fig. l is a perspective view of the connections for controlling the feed pawl;

Fig. 5 is a side elevation of the connections for moving the cylinders to and from operative position, and

F'g. 6 is a detail view, looking in the direction of the arrow 6 in Fig. 1.

Referring to the drawings, I have shown my invention as applied to a double index dobby of the usual form, having a frame 10, a plurality of jacks 11 pivoted at 12 to the frame 10, equalizers 13 pivoted at 14 to the jacks 11, and upper and lower hooks 15 and 16, pivotally connected to the opposite ends of theequalizers 13 and vertically positioned by dobby fingers 17 pivoted at 18 in the frame 1 y The fingers Hare controlled by pattern cylinders 19 and 20 (Fig. 2) and move the hooks 15 and 16 into or out of positionfor engagement by lifter bars 21and 22connected by links 23 to .a rocker lever 24, which lever is alternately moved in opposite directions by driving connections not shown. All of the parts thus far described are of the usual form and constitute no part of my in ventlon.

The. pattern. cylinders 19 and 20 are mounted on shafts 25 and 26 supported by slotted bearings 27 and 28. The cylinders 19 and 20 are rotated by means of worm gears 29 and 30. The worm gear 30 is engaged by a cylindrical driving member 31, comprising a dwell-worm portion at the right, as viewed in Fig. 1, and a circular rack portion at the left.

The worm gear 29 is similarly driven by aconioal driving member 32, comprising a dwell-worm portion at the left, and a circular rack portion at the right.

The driving members 31 and 32 are mounted on a horizonal shaft 33 which may be continuously rotated by means of a sprocket chain 34 from any suitable source of power.

With the parts positioned as shown in Fig. 1, the cylinder 20 will be intermittently rotated by the dwell-worm at the right of the driving member 31, while the cylinder 19 remains at rest with the worm gear 29 engaged by the circular rack at the right of the driving member 32. The pattern cylinder 20 is also operatively positioned so that its pattern pins may engage the depending portions 17 of the dobby fingers 17, while the cylinder 19 is positioned to the right and below the horizontal engaging portions 17 of the fingers 17.

The positions of the cylinders 19 and 20 are determined by links 35, (Fig. 5) each pivoted at one end on the shaft 25 and having a slotted connection at the other end with the shaft 26. The links 35 are connected by rods 36 to crank arms 37 formed on the opposite ends of a crank shaft 38. lVhen the crank arms are in the position shown in Fig. 1, the cylinders are in their extreme right hand positions and the cylinder 20 is operative. When the crank arms are moved to the position shown in Fig. 5, the cylinders are in their extreme left hand positions, and the cylinder 19 becomes op erative.

The slotted or lost-motion connection be tween the links 35 and the shaft 26 permits the cylinder 20 to have a shorter range 05 movement than the cylinder 19. The links 35 and rods 36 are both adjustable in length, so that the positions of the cylinders may be accurately determined.

The crank shalt 38 is provided with pulleys 39 and 40 (Figs. 1 and 2). A belt 41 (Fig. 1) connects the pulley 39 to one of the jacks 11, while a second belt 42 connects the pulley 40 to a spring 43. When the jack is moved to the dotted line position shown in Fig. 1, the crank shaft 38 is moved to the position shown in Fig. 5, and upon release of the jack, the spring 43 returns the shaft to the position shown in Fig. 1.

When either cylinder is moved to inoperative position, it is also held from rotation by engagement with its circular rack, and when moved to operative position it is intermittently advanced by engagement with its dwell-worm.

I will now describe the mechanism for controlling the position of the jack 11. A special finger 17 (Fig. 4) is provided which is not connected to control any or" the hooks 15 or 16. This finger 17 is provided with a U-shaped bracket 44, connected by a link 45 with one arm of a bell crank 46 on a bearing rod 47. A depending arm of the bell crank 46 is connected by a rod 48 to a depending arm 49 on a lever 50.

The lever 50 is provided with a shield 51 overlying a. ratchet wheel 52, mounted to move with a sprocket 53 (Fig. 2) carrying a pattern chain 54 (Fig. 1). A feed pawl 55 is adjustably connected to the rocking lever 24, and is prevented from engaging the wheel 52 by the shield 51, normally held in operative position by a spring 44 acting on the finger 17. A hook 56 is pivoted on the lever 50 in position to engage a tooth of the'ratchet 52 when the shield is withdrawn from normal position.

The operation of these parts is as follows :The speeial finger 17 (Fig. 4) is controlled by raised links 57 or 58 (Fig. l) on special pattern chains carried at the extreme ends of the cylinders 19 and 20. Nhenever one of these links 57 or 58 engages the finger 17, the finger is raised and withdraws the shield 51, which will then be held in withdrawn position by its hook 56. Upon the next stroke of the feed pawl 55, it will advance the ratchet 52 and sprocket 53 one space, correspondingly advancing the chain 54 one link, and also resetting the shield 51.

The chain 54 is provided with one or more raised links 54 adapted to engage a lever 60, mounted on a fixed pivot at 61, and connected by a link 62 to a lever 63, which in turn controls two of the dobby fingers 17 (Fig. 6). These fingers control the upper and lower hooks 15 and 16 corresponding to the jack 11 which actnates the crank shaft 38.

Whenever the lever is raised by a link 54 in the chain 54, the lever 63 raises the associated fingers 1'7, and the shaft is moved by one of the litter bars 21 or 22 to the dotted position of Fig. 1, thus rendering the cylinder 19 operative and the cylinder :20 inoperative. The parts will be held in this position until the link 04 is removed and the lever (30 is permitted to fall, releasing the said fingers 17.

I have shown and described specific multiplying mechanism for controlling the movements of the cylinders 19 and 20 to and from operative position, but my invention, in its broad aspects is not limited to such mechanism, as other suitable mechanism may be provided for controlling the movements oi the cylinders. It will also be evident that other changes and modifications can be made in the invention as herein disclosed within the scope and spirit of my invention as expressed in the claims, and I do not wish to be otherwise limited to the details herein disclosed, but what I do claim is:-

1. In a dobby, a pair of pattern cylinders, a set of dobby fingers operable by either cylinder, means to move said cylinders bodil 1 to and from operative position, and driving means for said cylinder continuously connected thereto but effective to rotate the operatively positioned cylinder only.

2. In a dobby, a pair of pattern cylinders, a set of dobby fingers operable by either cylinder, means to move either cylinder to operative position and the other cylinder simultaneously to inoperative position, and means to rotate the operatively positioned cylinder only.

3. In a dobby, a pair of pattern cylinders, a set of dobby fingers operable by either cylinder, and means to move said cylinders alternately to and from operative position, said means including a lost motion connection to one of said cylinders.

4. In a dobby, a pair of pattern cylinders, a set of dobby fingers operable by either cylinder, means to move one of said cylinders to and from operative position, a worm gear for said cylinder, and a driving member for said gear comprising a circular rack portion and a dwellworm portion.

5. In a dobby, a pair of pattern cylinders, a set of dobby fingers operable by either cylinder, means to move one of said cylinders in an inclined direction to and from operative position, a worm gear for said cylinder, and a conical driving member for said gear comprising a circular rack portion and a dwell-worn portion.

6. In a dobby, a pair of pattern cylinders, a set of dobby fingers operable by either cylinder, means to move the cylinders bodily to and from operative position, and pattern mechanism controlling said means, said mechanism comprising a feed pawl and ratchet, a shield for said ratchet, means to withdraw said shield, and means to hold said shield in withdrawn position until re leased by the operation of said feed pawl.

7. In a dobby, a pair of pattern cylinders,

a set of dobby fingers operable by either cylinder, means to move said cylinders bodily to and from operative position, and pattern mechanism controlling said means, said mechanism comprising a feed pawl and ratchet, a shield, means to withdraw said Shield, and a hook engaging .a tooth of said ratchet and effective to hold said shield in withdrawn position until said ratchet is ad vanced.

In testimony whereof I have hereunto affixed my signature.

HENRY BARDSLEY. 

